Add supports for application/x-www-form-urlencoded and multipart/form-data types

[tanmoysrt]

Currently, Lumi accepts only application/json. It's best because the data type doesn't convert to string when reached to the server.
But in some special cases, we may need application/x-www-form-urlencoded and multipart/form-data ,

So we are going to enable these options and the user will have the option to define the type of arguments so that Lumi can auto-cast the arguments before sending them to the function.